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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36698696645fb5c42da32b94fefa13eb595f8746a503045bacd2f8d6dc484fca' 
  AND token = 'LvCn4bELT3xXniJpXYGRuL88csbwYaTr46CyaS7+2HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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