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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8386d5fbf1e48ce3835530e8ce81d18b1782e8e63f371ec33c5ab048ff01f95' 
  AND token = 'lrTrWu8dESaVNTr6YsHvS9tv2vc52HYTu2QhQrF/Uno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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