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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7baea4a1f903c05fc096a9c38af20f361518e92c056f0ef529d33f15d4a58e4' 
  AND token = '+DfLZox2u+FOisDgxqq0RJ5PSN4pfkvvEfqp87+R60c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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