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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e183b2fc63ff3d29c42253bba16dcb873f1de26237c66792b8234ec628c94c' 
  AND token = 'OBKt9+s0SxWuG0vN10qmxPEgNV/O/1qcAzNlI0DE+bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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