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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a931a41fd4194cea6ef9ef746c9ac549e52d58e67bb9453d998d46d5ea4d1d2f' 
  AND token = '07q2s52WRyYJM5WiIim/wY4Ok2O8/DNe4ZhXL0P5pTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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