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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a77602f83e6956d3778739a5d49573ea5fdae0d0091416a12d3f3a125f2c624e' 
  AND token = 'TLc/+g9ybQCl25xlyLdGXY0haT2hGD1+d5F7FfuJnqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}