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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4868cb7568639ab39d2ae276dc24bae87d628a4420445dc9d3170856db3451ad' 
  AND token = 'DcAgpE6Uz6o/KZOQpYleXWbt1/JJenMozGKF2FgGqr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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