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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcf3c1442333fc6b94d039d374c07b1c8985d5ae43cc1b0d33b4883c056a7397' 
  AND token = 'Yc3VxPfxhp9QMWMaOQbcWAQeXI9w5Kw5FWh/fdJkVRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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