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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc36caaf39a5362d6fbfa50ddef89d2bfd0ac02350d062f4f0c5a58f9e2b9dff' 
  AND token = 'higQuSmBVfV172N1k2pCyOI+ji45gs5fPk1Ecd3XPVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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