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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '027b9ee715301bc0d9b0e0b391fdfcf94a680608c01f62d1db263a65adb80f61' 
  AND token = 'js0h+sBi1U76M6KUhW2cnc49mvR9t/KXe/fHmoTWsqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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