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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9acff74cd442dcda4f41884dea7cb364d8999e6f01adda3b1196891d33ca649' 
  AND token = 'I9HDb+dxKmYqd60bFXG1efqo7prvnHszg0xQrn35K0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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