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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e72e56528b7327ef5a10e6b3842b6b6b2233f8424ff46cbf1554a1a1fc72d239' 
  AND token = 'aMKtHA5kc4HjWUsSixNdfaZA64ccKb2F6KUnQBms/w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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