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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5970e83a8537273c07768935707a31a7557e49123c88f82bba36fa356bea10f' 
  AND token = 'eCokqrQCQp117y3EGNb7uxDd5zSg1RuGhvO1nYV+fNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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