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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c67665e528e9c10a676c44eef939cb800ecc7179f3caf8614f30382dcf62d87' 
  AND token = 'K0Vf+QV4T3ipVbsxXXVV0Qt0k6XwYFGO3DB7haOpYJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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