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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a41fb377b94d8f32c979eb46a815d95288c5803989c1c5a5e53f3122be4cf630' 
  AND token = 'FOvgvDAWsfmP0Qu/rJQo4iSqPiTcc47ss0F7HfUG0rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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