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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '020c3c50e387e1c89ddf405ca1c7f97ead22771280ace9068cfab4abae23bc73' 
  AND token = 'tlUsnot37M/yo85oKKnl5VhNH4FCAI+9dsM07xS/4h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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