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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da4470d6dd54a1863ed2be56e118f14e341aea3a37b68ef2e185842c6980d40f' 
  AND token = '/P7HWAg990OJBwnuW5tVT7We7dvviN/uUJhWhuFgcX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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