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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9cac5d54b34c11e19a45a84db69e243a8f19362a0e355e37c68109e1f44692a' 
  AND token = 'dTwN9RlaOPZAZV3q16BA/UjQujWrdZc2isUx8N30KUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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