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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7d6c37acc67bb0f167487ded544fccb992bef4004047875113dcd25a68db553' 
  AND token = 'BXAee3UiZ0S7ySnEHL11Bw7hj9fGZdu7x4XpWcMXU4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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