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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93a88e86c5d1b6c71fa19acb3d070d95d7852092f2e6c5a5416a54c7b1cd0efa' 
  AND token = '5klXebWbbledZmQx7j1aNss735D0G1SrTV77ktJ1b6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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