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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '565057310cdee74af483e4cc7e157998671dea73d68fab1c8a3aefe5567f8944' 
  AND token = 'LN2al4oJwAE5hFYOTT85qbJeV6kHVKA6aKyMv76054U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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