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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e38841cc5e3672e1421803f24451df7d41007234ae7706d9cab2de30c6d8ad90' 
  AND token = '9ZD/87B+YMBQ6BlzytN0UDxHp+Qc2lmSsfk4kJ4FCRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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