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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7cc558ec03a0025f18e6eeae23019940bb42b2643ec861aad46e4d46212b67e' 
  AND token = 'u1UKlOIIM9fgy4oSP0utqe+092IG8otsuWUHp3D+3LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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