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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3d1c44492c37a1377588494ae516a59b5e637b4ef1318d7991b8be75b378d6c' 
  AND token = '5hEAesvynGcqaAr4UXqpmLSt1GeC5MgzbGR1vWt//2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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