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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '474788f79f90102ba0546917651fb69c4aaec53e038b42c1576f6d1bf0f753c6' 
  AND token = '36uB0fWXm4f+nWvm8n/E1WfktMS7Qp0YhYERxDqDZ18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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