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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1cac13608da303c1b391b6b9a82679817c0f75a0fd1d326c295a33eeac95fad' 
  AND token = 'hl0Cx7iCpbLryxORpqGz2kqZDW7f7g8keDnnfDoDh70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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