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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50e4dc6401cf6be909e625c68b2e96a56c6b739926ebed473fd7f029942cfb47' 
  AND token = 'YURJuAb2PcBXtqB0EoFD/puZ5N8i19Ptoy8+EVfXPQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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