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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f226d94527c46e287a153994d275f3a95d4793ede8db800ce933f4e6b9ea6cd' 
  AND token = '0bbB+8sHzGzcgsvJQVbeTVFVjuSQVuzSfDBZeSxfZ8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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