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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d7ee62d3fb8cba50cfb9237b1596bab8657ef1b5f95f3c20d2c2a2d9ba66686' 
  AND token = '9scQjsdYZyzpSV3JnJny93ipu4IF+4u2x+qvokylANA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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