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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '906ef57dabbe64d7c1ba826546e37a5179c1409e608a8c315eb1f4b3599e8bab' 
  AND token = 'inCkKmikR5ggca4vjU4R6M8DhQ1wRujHd4vwUBfCFp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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