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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd05234e1c4ca314eabf4d6cb4cc64ddf9f4895fb79b64694944c3d2a9f2de015' 
  AND token = 'eJu9B4YDeiR/MsyMKkvWZS/v1OKW+CBz51U/daWP/Ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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