SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46485ad51d496e8ff95b421a64dfa06dd9e85283c59f4abb2507d40365db625c' 
  AND token = '+Vz4t9U+D9CKzXjCtNGDrqEwCDQd7Ov/f0GA7GGgCeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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