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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '976357e839a91459090a38c865e5ba3bf7be107f00fe468fd076c2e067f53bfa' 
  AND token = 'hAEzpIauHSPhd0GfQbugMlI/+Ikdb8DFm2Viyw7H92A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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