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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2accab952ba4f4a58124f6f9b3657987be8f01eb5df5834189c6e7f485ad2526' 
  AND token = 'NtVJYzV86Du/Wu6QVkZpDafBiauIrmrN2innX7xfI0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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