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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20a3b5ab23c10c1a00048180265c16c892408d5e155a547bad10cae9f5920a8a' 
  AND token = 'zKSI5soE4VrwAgb+7pCpmhqGcwueA1wnuA0RQLPP1Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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