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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7b79af4acc3c3292903beeb181d08bc6e59bce356e438e9ce71088dd3e164f6' 
  AND token = '3iJR5COMGtNgeNQnMUfqgtL8peXYkHtzqiMb4eKqVXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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