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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a3f57cc675445b79f67c73ff070fd8b2c0999f53cb3b2bb26667f79ceb36bd0' 
  AND token = 'Mw4HGYCfcq8A2wWpQKPQ6mypfKKr3vS4dbNdTtyg82g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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