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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f06e49ee4819c4e942625d079ca4431c27f7b8ebcb2103724930caf9fce6311' 
  AND token = 'jkhBuE4bcmHv4XzH02QSEyLz6P2dqRoJYw6qtOyWAfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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