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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53372980de439f0d988f0bab4ebb9603004d5404a340998baa3745a25627513e' 
  AND token = 'Mm0799OjUKkYlhaBGiS+a2wtyYj9N0EwWT7XnCKWztA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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