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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb8035dd4aa8ec85c388fc641ddabcd9fae65a40586f49d081e6ff0ed9d62b90' 
  AND token = 'RJaG5cR/I+JvcELRhmYGId3+CxYVYCKWK0hy3VcKQkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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