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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b057fedb63c0e8fc56ac4372e663d8bdeb5c314eac2704e611817d6b66110df5' 
  AND token = 'C0rbHPy/P53SX0OgMaUNs3eIPonoVOvIYgYMGS/bq5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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