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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '817fe86cbc035bd5bb673db593f6e6af4605f848d16e6126e6334ad8e820c7dd' 
  AND token = 'TPqdQC1WZDd8c5+uquR2DZ80lYBaEXlKurR3GOJQeFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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