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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a58fef2b14f3887d667d99cbe54da504748756ae5fe9c74db9d6398bda19d32' 
  AND token = 'Chx94lVMi6BoY9r91YhpVYyLlRsr2hoHu2huM1VPabk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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