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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '242bc7c1362f0e05f6e9895dea5adce768e8f21cfa3a6b7e5e727f83128a9ad2' 
  AND token = 'RuY+Kv6QHAlyXACidIJufAy+5mfuC0771OJe0Th+KmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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