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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad09091038e7353d341f8eb057a6ac27efa47f90c5532acef333ab3bc55577f4' 
  AND token = '/qt/2X5ZCI6zQXx3YbfqOnN6E0KfI/SMp8WyxEXPJ6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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