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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf38c2d917f1d99739486d2ce9564ed640b369ed339796cf4df829e03a2a3c64' 
  AND token = 'vb79XBUnQ8h+KSfBcksNKUFDzzgc8TvWu2d70WZdKXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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