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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01fb1f831d91c8e74e246ac60752de60d4b1ce7f6730478cd51863b0f5c5d71b' 
  AND token = '9XvYP5kPhrF313cOcYbE7ZCbZwG925CqIv6SgZ31RlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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