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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c871a6890d4af06b307e36c1a74d64fd520224e171eaa0beaa3239275fcf36c5' 
  AND token = '8v8zf2q9/h2A7SCNJYxGQIpaFJCtiD53fDVN0PDtCT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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