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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07083fed6b98f8123966e0699bfa7c32f23d19a31cef17a4104949112b5379bd' 
  AND token = 'zozvcpVT38J10smxHBea8Wch/A34q/1Lj0Iy0fbRqmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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