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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcb0726dce7b4afc3ca20c817577b2442da73dce69ba75292ce8230ab74c0455' 
  AND token = 'N0VF3l8+PG/LE0XyRoGks9Tj++THpl2FU3yRnKiK3qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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