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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20f77ec16d816d295f9d05d37d896d5515ae873d1aa4cf211216b04bbe81c2a6' 
  AND token = 'mhcUweCEwKbhYDPF3wBoAjDcl477/ARmvnO38WkC2c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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