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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc1f8c85c0b54d7b57c524f21e2166898d2d3d2c3e5adc04d7185c4c82d6fec7' 
  AND token = 'Snq37ME7DzmMxzrNiPZuql54nPhXV0IJwcz1VwbQsw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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