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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e20fed11914595a6e47e5a8a7203b7dd634048bb3ffadb0345492fb9a7513c6f' 
  AND token = 'k2pvQYNIAr5LFOxNmRw4o/8tB8Hh889kbn29nOBsa44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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