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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e751469e11d44c363ba9eb574a132c0c73be82f1a9bed7816821a4c101142c0' 
  AND token = 'gxDeBnalS1CmQQPMOCwVeyWxTIAsWLnx3VPXo0CRpCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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