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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9facf4049f02330005dad5d68fc0e352ae71c139a49ce0b1d95d9820ea8554f8' 
  AND token = 'CmZc4EyogjyQZ5PZgogP4/CsCRXMWs4MtrUmTMQlyiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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