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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b119f01159d3b14b5b618c72e01dfc8f6f2e78c8bd9ffdb3ac3b98b9e4610cac' 
  AND token = 'vsaE2AaccxbOcrbxXFmje30IaDcn5ctQRQdpAz71lnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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